State the energy changes in the following cases while in use:

(a) Loudspeaker

(b) A steam engine

(c) Microphone

(d) Washing machine

(e) A glowing electric bulb

(f) Burning coal

(g) A solar cell

(h) Biogas burner

(i) An electric cell in a circuit

(j) A petrol engine of a running car

(k) An electric iron

(l) A ceiling fan

(m) An electromagnet.

Name the process used for producing electricity from nuclear energy.

Complete the following sentence

The conversion of part of energy into an undesirable form is called ……

Define the term potential energy of a body. Name its two forms and give one example of each.